Archive for category: Patterns

Thread-Safe Queue – Two Serious Errors

July 1, 2023

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In my last post "Monitor Object" I implemented a thread-safe queue. I made two serious errors.…

Monitor Object

June 26, 2023

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The monitor object design pattern synchronizes concurrent member function execution to ensure that only…

ConcurrencyPatterns

Active Object

June 18, 2023

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The active object design pattern decouples method execution from method invocation for objects that each…

DealingWithMutation

Dealing with Mutation: Guarded Suspension

May 29, 2023

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Guarded Suspension applies a unique strategy to deal with mutation. It signals when it is done with…

DealingWithMutation

Dealing with Mutation: Thread-Safe Interface

May 22, 2023

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I continue my journey with concurrency patterns in today's post. The Thread-Safe Interface fits very…

DealingWithMutation

Dealing with Mutation: Locking

May 15, 2023

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Locking is a classical way to protect a shared, mutable state. Today, I will present the two variants,…

Sharing

Dealing with Sharing

May 8, 2023

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If you don’t share, no data races can happen. Not sharing means that your thread works on local variables.…

ConcurrencyPatterns

Concurrency Patterns

April 30, 2023

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There are many well-established patterns used in the concurrency domain. They deal with synchronization…

Reactor

Reactor

April 23, 2023

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Event-driven applications, such as GUIs or servers, often apply the architecture pattern Reactor. A Reactor…

Model-View-Controller

April 17, 2023

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The Model-View-Controller (MVC) is one of the classic architectural patterns from the book "Pattern-Oriented…

Latest news

std::executionNovember 18, 2024 - 9:03 am
std::execution, previously known as executors or Senders/Receivers, provides “a Standard C++ framework for managing asynchronous execution on generic execution resources“. (P2300R10) Side Note Change of plans. My original plan was to present the C++26 library after the core language. However, the implementation status of the library is not good enough. Therefore, I decided to continue […]
C++26 Core Language: Small ImprovementsNovember 4, 2024 - 8:34 am
There are more small improvements in the C++26 language, which you should know. static_assert extension First, here’s the syntax of static_assert in C++11: static_assert(compile time predicate, unevaluated string) With C++26, the string can be a user-defined type having the following properties: static_assert can now be used with a format string. Here’s a nice example from […]
Placeholders and Extended Character SetOctober 28, 2024 - 10:19 am
Placeholders are a nice way to highlight variables that are no longer needed. Additionally, the character set of C++26 will be extended. Placeholders Structured bindings are a C++17 feature that allows you to bind multiple variables to the elements of a structured object. The following program demonstrates using tuples and structured bindings to return and […]
Contracts in C++26October 21, 2024 - 9:54 am
Contracts allow you to specify preconditions, postconditions, and invariants for functions. Contracts should already be part of C++20 but were removed in the standard meeting in Cologne. Here is what Herb Sutter said about contracts on Sutter’s Mill: “contracts is the most impactful feature of C++20 so far, and arguably the most impactful feature we […]
Reflection in C++26: Determine the LayoutOctober 14, 2024 - 9:42 am
Thanks to reflection, you can determine the layout of types. My examples are based on the reflection proposal P2996R5. Class Layout The following program determines the class layout of a few members. // classLayout.cpp #include <experimental/meta> #include <iostream> #include <utility> #include <vector> #include <array> struct member_descriptor { std::size_t offset; std::size_t size; bool operator==(member_descriptor const&) const […]
Reflection in C++26: Metafunctions for Enums and ClassesOctober 7, 2024 - 1:53 pm
Today, I continue my journey through reflection in C++26 and play with enums and classes. The names of the metafunctions to access an Enum or a Class member are often identical. Access the Members of an Enum The following program is based on one by Daveed Vandevoorde. Daveed is one of the fathers of reflection, […]